I had a problem with a fresh 12-1 455 rebuild using 1016s. It was pulling water into the cylinders during initial start up. I took it apart to checked everything out and didn't find anything wrong. I had the heads resurfaced and put a new set of gaskets on.
I ran it though one heat cycle with no water in it. After it cooled down i added water and did not have anymore issues.
Tom Syron
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